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Commits on Mar 29, 2026

• [JSC] Introduce butterfly-less objects

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Commits on Mar 28, 2026

• [JSC] Fix null butterfly dereference in JSValue::dumpInContextAssumingStructure

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• [JSC] Reduce size of Wasm GC objects by dropping m_rtt

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Commits on Mar 27, 2026

• [JSC][WASM][Debugger] Make the WASM debugger stop at unreachable traps

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• [JSC] Introduce Realm-less Objects

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Commits on Mar 26, 2026

• [JSC] TypedArray `[[Set]]` should check receiver before writing to typed array

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• [JSC][WASM][Debugger] Fix WASM debugger stop-the-world races during VM construction and destruction

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Commits on Mar 25, 2026

• [JSC] Non-transitioning Wasm GC structure

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• [JSC] `String#repeat` should not resolve rope when building a rope result

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• [JSC] Handle `Error.isError` in DFG/FTL with `IsCellWithType` node

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Commits on Mar 24, 2026

• Add wasm multimemory support to base instructions

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Commits on Mar 23, 2026

• [JSC] Remove UB for truncate-double-to-int32 by injecting conversion inline asm

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• [JSC] Remove rope suffix eval cache

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Commits on Mar 20, 2026

• Unreviewed, revert 297750@main

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Commits on Mar 19, 2026

• [JSC] Add fast path for MicrotaskCall in callMicrotask

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• [JSC] Flush ProfilerSupport queue at jsc shell exit

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• [JSC] Fix SIGSEGV in `Temporal.PlainDate.from` with out-of-range month and `overflow: "reject"`

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Commits on Mar 18, 2026

• Unreviewed, reverting 307787@main.

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• [JSC] Improve the performance of maps in VariableEnvironments

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• [JSC] Introduce better heuristics for rope resolution ordering

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• [JSC] Use page-based zero-fill for large zero-clear for ArrayBuffer

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Commits on Mar 17, 2026

• [JSC] Check for all indexed accessors in Array.p.concat

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• [JSC] Fix tryConvertToStrictInt32's duplicate work

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• [JSC] Implement `await using` syntax from Explicit Resource Management proposal

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Commits on Mar 16, 2026

• [JSC] Move B3ReduceSIMDShuffle to B3ReduceStrength for now

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Commits on Mar 15, 2026

• [JSC] Set methods should throw TypeError when iterator next() returns non-object

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• [CSS JIT] Add dumpCSSJITDisassembly runtime option

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Commits on Mar 14, 2026

• [JSC] Support fast C++ -> JS calls in x64

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• [JSC] Add MicrotaskCall

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• [JSC] Implement SIMD Shuffle reduction

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Commits on Mar 13, 2026

• [ARMv7] Disable JIT

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• [JSC] Add tryConvertToStrictInt32

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• [JSC] Add ArrayIsArray intrinsic for Array.isArray

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• [JSC] Array.prototype.copyWithin should return ToObject(this) when finalIndex < from

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  sosukesuzuki

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Commits on Mar 12, 2026

• [JSC] `RegExp#@@matchAll` fast path should clamp lastIndex > 2^53-1 to 2^53-1

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